I feel the hobby is changing. It's hardcore folks that have been doing this for several decades grew up learning casting numbers, we studied H-O Racing's and Pete McCarthy's books. One needed to know casting numbers to improve their performance. Nowadays enthusiasts go to Butler's website or KRE's. They're more concerned about d-port or round ports. I also feel this will limit the market for heads with casting numbers.
We made our first pair of "stealth" heads around 1998. I believe they were the first "wide-port" heads also.
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